Is it wrong of me to drug test my boyfriend?

Me

We’ve been together for a year and a half. He’s always taken norcos once in awhile and I was fine with it. But I started noticing over the past couple months that he’s been taking them a lot more..and lying about how often he’s taking them. I have become uncomfortable with how frequently he’s taking them so I sat him down. I asked him if he was becoming addicted. Asked him if he had it under control. I asked him if he needed help. Then I told him I wasn’t ok with it and asked him to stop taking them for awhile. He agreed without a problem. So I took all the norcos that I knew of out of the house and hid them. It’s been two days and today I caught him digging around in his socks in the closet..asked him what he was doing and he said he was just putting his socks away. A couple hours later I went into the closet and felt around his socks. Found 3 norcos under them. I would like to drug test him in a couple days to see if he actually stopped or not. Is that wrong?